LXT971ABC datasheet(19/90 Pages) INTEL

19 / 90 page

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver

Datasheet

Document #: 249414

Revision #: 002

Rev. Date: August 7, 2002

Table 5. LXT971A Power Supply Signal Descriptions

PBGA

Pin#

LQFP

Pin#

Symbol

Type

Signal Description

VCCD

–

Digital Power. Requires a 3.3V power supply.

D4, E3

E4, F3

F4, C6,

C3, G7,

7, 11, 18,

25, 34,

35, 41,

50, 61

GND

–

Ground.

E5, D5

8, 40

VCCIO

–

MII Power. Requires either a 3.3V or a 2.5V supply. Must

be supplied from the same source used to power the MAC

on the other side of the MII.

G3, G4

21, 22

VCCA

–

Analog Power. Requires a 3.3V power supply.

Table 6. LXT971A JTAG Test Signal Descriptions

PBGA

Pin#

LQFP

Pin#

Symbol

Type1

Signal Description

TDI2

Test Data Input. Test data sampled with respect to the

rising edge of TCK.

TDO2

Test Data Output. Test data driven with respect to the

falling edge of TCK.

TMS2

Test Mode Select.

TCK2

Test Clock. Test clock input sourced by ATE.

TRST2

Test Reset. Test reset input sourced by ATE.

1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain.

2. If JTAG port is not used, these pins do not need to be terminated.

Table 7. LXT971A LED Signal Descriptions

PBGA

Pin#

LQFP

Pin#

Symbol

Type1

Signal Description

LED/CFG1

LED/CFG2

LED/CFG3

I/O

LED Drivers 1-3. These pins drive LED indicators. Each

LED can display one of several available status

conditions as selected by the LED Configuration Register

(refer to Table 56 on page 85 for details).

Configuration Inputs 1-3. These pins also provide initial

configuration settings (refer to Table 9 on page 30 for

details).

1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain.

2. Pull-up/pull-down resistors of 10 k can be implemented if LEDs are used in the design.

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